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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_BASE_EXTERNAL_ESTIMATE_PROVIDER_H_
#define NET_BASE_EXTERNAL_ESTIMATE_PROVIDER_H_
#include <stdint.h>
#include "base/macros.h"
#include "base/time/time.h"
#include "net/base/net_export.h"
namespace net {
// Base class used by external providers such as operating system APIs to
// provide network quality estimates to NetworkQualityEstimator.
class NET_EXPORT ExternalEstimateProvider {
public:
class NET_EXPORT UpdatedEstimateDelegate {
public:
// Will be called when an updated estimate is available.
virtual void OnUpdatedEstimateAvailable() = 0;
protected:
UpdatedEstimateDelegate() {}
virtual ~UpdatedEstimateDelegate() {}
private:
DISALLOW_COPY_AND_ASSIGN(UpdatedEstimateDelegate);
};
ExternalEstimateProvider() {}
virtual ~ExternalEstimateProvider() {}
// Returns true if the estimated RTT duration is available, and sets |rtt|
// to the estimate.
virtual bool GetRTT(base::TimeDelta* rtt) const = 0;
// Returns true if the estimated downstream throughput (in Kbps -- Kilobits
// per second) is available, and sets |downstream_throughput_kbps| to the
// estimate.
virtual bool GetDownstreamThroughputKbps(
int32_t* downstream_throughput_kbps) const = 0;
// Returns true if the estimated upstream throughput (in Kbps -- Kilobits
// per second) is available, and sets |upstream_throughput_kbps| to the
// estimate.
virtual bool GetUpstreamThroughputKbps(
int32_t* upstream_throughput_kbps) const = 0;
// Returns true if the time since network quality was last updated is
// available, and sets |time_since_last_update| to that value.
virtual bool GetTimeSinceLastUpdate(
base::TimeDelta* time_since_last_update) const = 0;
// Sets delegate that is notified when an updated estimate is available.
// |delegate| should outlive |ExternalEstimateProvider|.
virtual void SetUpdatedEstimateDelegate(
UpdatedEstimateDelegate* delegate) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(ExternalEstimateProvider);
};
} // namespace net
#endif // NET_BASE_EXTERNAL_ESTIMATE_PROVIDER_H_
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